Heavy Core Bass Strings are for bass players who tune down and dig in. We craft these strings with thicker core wires for standard feel and tonal definition. With Heavy Core Bass Strings, you can play with your natural attack and retain big, punchy fundamentals when tuning below E-Standard. Each Heavy Core Bass String set is optimized for a specific range of tunings: Heavy for Drop D and D Standard; Heavier for Drop C and C Standard; and Heaviest for Drop B and B Standard.